Lymphoscintigraphy is an accepted and commonly performed procedure used for staging of certain cancers, especially melanoma and breast cancer. It involves injecting a small amount of radioactivity under the skin in order to identify lymph nodes which should be biopsied (i.e., the "sentinel node") to determine if cancer has spread. Our objective is to evaluate the potential benefit of a new, camera-based technology which allows actual images to be obtained intraoperatively in the identification of sentinel nodes.